Hi soussicd;
The Performance Pack works just fine on the 2015 - with respect to the Performance Pack they are all the same from 2004 right through to 2015 and soon, 2016
It makes a significant difference in the acceleration rate of the bike. In fact, there is almost no other modification that will do the same thing.
With respect to shifting problems on the 125r - these are all temporary issues that tend to occur when the transmission is new. By the time a person gets to about 3,5000 kilometers these issues are gone as the transmission has broken in. The clearances in the transmission are very tight when new and it needs to be broken in.
I don't recall which videos I have but you can find most of them on the link below. Any of the instruction videos are restricted only to people that have bought from us
https://www.youtube.com/channel/UC0Bz2I ... IiopJaGhKg